Vulnerability · Published Apr 22, 2021 · Assigned by siemens
CVE-2021-25664
High 7.5
In plain English
A high-severity infinite loop in Capital Embedded AR Classic 431-422 from Siemens. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.9% (higher than 80% of all known vulnerabilities).
Official description
A vulnerability has been identified in Capital Embedded AR Classic 431-422 (All versions), Capital Embedded AR Classic R20-11 (All versions < V2303), Nucleus NET (All versions), Nucleus ReadyStart V3 (All versions < V2017.02.4), Nucleus ReadyStart V4 (All versions < V4.1.0), Nucleus Source Code (All versions including affected IPv6 stack). The function that processes the Hop-by-Hop extension header in IPv6 packets and its options lacks any checks against the length field of the header, allowing attackers to put the function into an infinite loop by supplying arbitrary length values.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Siemens | Capital Embedded AR Classic 431-422 | 0 – before * |
| Siemens | Capital Embedded AR Classic R20-11 | 0 – before V2303 |
| Siemens | Nucleus NET | All versions |
| Siemens | Nucleus ReadyStart V3 | 0 – before V2017.02.4 |
| Siemens | Nucleus ReadyStart V4 | 0 – before V4.1.0 |
| Siemens | Nucleus Source Code | 0 – before * |
Weakness: CWE-835 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C